code: def test_no_lru_alloc_dtype(self):
      data = Tensor.randn(9 * 27 * 4).realize()
      it = data.cast(dtypes.imagef((9, 27, 4))).realize()
      b1 = it.lazydata.base.realized._buf
      del it
      it = data.cast(dtypes.imageh((9, 27, 4))).realize()
      assert it.lazydata.base.realized._buf != b1
  
file_path: tinygrad/test/test_image_dtype.py
imports: import unittest
  import numpy
  from tinygrad import Device, dtypes, Tensor, Variable
  from tinygrad.dtype import ImageDType
  from tinygrad.features.image import to_image_idx
label_desc: Use image node_id 9 for calling the TestImageDType obj's underlying member method code with example usage: obj.test_no_lru_alloc_dtype() without return types